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authorSagi Grimberg <sagig@mellanox.com>2015-04-19 20:27:20 +0300
committerNicholas Bellinger <nab@linux-iscsi.org>2015-05-30 22:41:42 -0700
commit8287fa5fb43c3fa05748560b8e13b91c4e88f586 (patch)
tree71e23ef67207d3558904bb6a4eb04984a0614059 /drivers/target/target_core_file.c
parentf75b6fae1a1d0a79dcbb9cbaed1d06bf3fe57a3c (diff)
target/file: Remove fd_prot bounce buffer
The reason this bounce buffer exists is to allow code reuse between rd_mcp and fileio in DIF mode. But the fact is, that this bounce is really not needed at all, we can simply call sbc_dif_verify on cmd->t_prot_sg and use it for file IO. This also removes fd_do_prot_rw as fd_do_rw was generalised to receive file pointer, block size (8 bytes for DIF data) and total data length. (Fix apply breakage from commit c836777 - nab) Tested-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_file.c')
-rw-r--r--drivers/target/target_core_file.c128
1 files changed, 28 insertions, 100 deletions
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index deec7560f835..fe6c19c1e001 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -258,75 +258,15 @@ static void fd_free_device(struct se_device *dev)
kfree(fd_dev);
}
-static int fd_do_prot_rw(struct se_cmd *cmd, struct fd_prot *fd_prot,
- int is_write)
+static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
+ u32 block_size, struct scatterlist *sgl,
+ u32 sgl_nents, u32 data_length, int is_write)
{
- struct se_device *se_dev = cmd->se_dev;
- struct fd_dev *dev = FD_DEV(se_dev);
- struct file *prot_fd = dev->fd_prot_file;
- loff_t pos = (cmd->t_task_lba * se_dev->prot_length);
- unsigned char *buf;
- u32 prot_size;
- int rc, ret = 1;
-
- prot_size = (cmd->data_length / se_dev->dev_attrib.block_size) *
- se_dev->prot_length;
-
- if (!is_write) {
- fd_prot->prot_buf = kzalloc(prot_size, GFP_KERNEL);
- if (!fd_prot->prot_buf) {
- pr_err("Unable to allocate fd_prot->prot_buf\n");
- return -ENOMEM;
- }
- buf = fd_prot->prot_buf;
-
- fd_prot->prot_sg_nents = 1;
- fd_prot->prot_sg = kzalloc(sizeof(struct scatterlist),
- GFP_KERNEL);
- if (!fd_prot->prot_sg) {
- pr_err("Unable to allocate fd_prot->prot_sg\n");
- kfree(fd_prot->prot_buf);
- return -ENOMEM;
- }
- sg_init_table(fd_prot->prot_sg, fd_prot->prot_sg_nents);
- sg_set_buf(fd_prot->prot_sg, buf, prot_size);
- }
-
- if (is_write) {
- rc = kernel_write(prot_fd, fd_prot->prot_buf, prot_size, pos);
- if (rc < 0 || prot_size != rc) {
- pr_err("kernel_write() for fd_do_prot_rw failed:"
- " %d\n", rc);
- ret = -EINVAL;
- }
- } else {
- rc = kernel_read(prot_fd, pos, fd_prot->prot_buf, prot_size);
- if (rc < 0) {
- pr_err("kernel_read() for fd_do_prot_rw failed:"
- " %d\n", rc);
- ret = -EINVAL;
- }
- }
-
- if (is_write || ret < 0) {
- kfree(fd_prot->prot_sg);
- kfree(fd_prot->prot_buf);
- }
-
- return ret;
-}
-
-static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl,
- u32 sgl_nents, int is_write)
-{
- struct se_device *se_dev = cmd->se_dev;
- struct fd_dev *dev = FD_DEV(se_dev);
- struct file *fd = dev->fd_file;
struct scatterlist *sg;
struct iov_iter iter;
struct bio_vec *bvec;
ssize_t len = 0;
- loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size);
+ loff_t pos = (cmd->t_task_lba * block_size);
int ret = 0, i;
bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
@@ -352,7 +292,7 @@ static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl,
kfree(bvec);
if (is_write) {
- if (ret < 0 || ret != cmd->data_length) {
+ if (ret < 0 || ret != data_length) {
pr_err("%s() write returned %d\n", __func__, ret);
return (ret < 0 ? ret : -EINVAL);
}
@@ -363,10 +303,10 @@ static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl,
* block_device.
*/
if (S_ISBLK(file_inode(fd)->i_mode)) {
- if (ret < 0 || ret != cmd->data_length) {
+ if (ret < 0 || ret != data_length) {
pr_err("%s() returned %d, expecting %u for "
"S_ISBLK\n", __func__, ret,
- cmd->data_length);
+ data_length);
return (ret < 0 ? ret : -EINVAL);
}
} else {
@@ -612,7 +552,9 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
enum dma_data_direction data_direction)
{
struct se_device *dev = cmd->se_dev;
- struct fd_prot fd_prot;
+ struct fd_dev *fd_dev = FD_DEV(dev);
+ struct file *file = fd_dev->fd_file;
+ struct file *pfile = fd_dev->fd_prot_file;
sense_reason_t rc;
int ret = 0;
/*
@@ -630,51 +572,39 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
* physical memory addresses to struct iovec virtual memory.
*/
if (data_direction == DMA_FROM_DEVICE) {
- memset(&fd_prot, 0, sizeof(struct fd_prot));
-
if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
- ret = fd_do_prot_rw(cmd, &fd_prot, false);
+ ret = fd_do_rw(cmd, pfile, dev->prot_length,
+ cmd->t_prot_sg, cmd->t_prot_nents,
+ cmd->prot_length, 0);
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
- ret = fd_do_rw(cmd, sgl, sgl_nents, 0);
+ ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
+ sgl, sgl_nents, cmd->data_length, 0);
if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
- u32 sectors = cmd->data_length / dev->dev_attrib.block_size;
+ u32 sectors = cmd->data_length >>
+ ilog2(dev->dev_attrib.block_size);
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
- 0, fd_prot.prot_sg, 0);
- if (rc) {
- kfree(fd_prot.prot_sg);
- kfree(fd_prot.prot_buf);
+ 0, cmd->t_prot_sg, 0);
+ if (rc)
return rc;
- }
- sbc_dif_copy_prot(cmd, sectors, true, fd_prot.prot_sg, 0);
- kfree(fd_prot.prot_sg);
- kfree(fd_prot.prot_buf);
}
} else {
- memset(&fd_prot, 0, sizeof(struct fd_prot));
-
if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
- u32 sectors = cmd->data_length / dev->dev_attrib.block_size;
-
- ret = fd_do_prot_rw(cmd, &fd_prot, false);
- if (ret < 0)
- return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ u32 sectors = cmd->data_length >>
+ ilog2(dev->dev_attrib.block_size);
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
0, cmd->t_prot_sg, 0);
- if (rc) {
- kfree(fd_prot.prot_sg);
- kfree(fd_prot.prot_buf);
+ if (rc)
return rc;
- }
- sbc_dif_copy_prot(cmd, sectors, false, fd_prot.prot_sg, 0);
}
- ret = fd_do_rw(cmd, sgl, sgl_nents, 1);
+ ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
+ sgl, sgl_nents, cmd->data_length, 1);
/*
* Perform implicit vfs_fsync_range() for fd_do_writev() ops
* for SCSI WRITEs with Forced Unit Access (FUA) set.
@@ -683,7 +613,6 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
if (ret > 0 &&
dev->dev_attrib.emulate_fua_write > 0 &&
(cmd->se_cmd_flags & SCF_FUA)) {
- struct fd_dev *fd_dev = FD_DEV(dev);
loff_t start = cmd->t_task_lba *
dev->dev_attrib.block_size;
loff_t end;
@@ -697,17 +626,16 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
}
if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
- ret = fd_do_prot_rw(cmd, &fd_prot, true);
+ ret = fd_do_rw(cmd, pfile, dev->prot_length,
+ cmd->t_prot_sg, cmd->t_prot_nents,
+ cmd->prot_length, 1);
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
}
- if (ret < 0) {
- kfree(fd_prot.prot_sg);
- kfree(fd_prot.prot_buf);
+ if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- }
if (ret)
target_complete_cmd(cmd, SAM_STAT_GOOD);

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